RBS
As always, thank you Nick, for your learned explanation.
I have stalled a 47, 205, 206, 212, 214ST, 500C, 500D, 55, 55T, 58, 58T and 61 (never stalled the 76).
Many have probably encountered it whether they recognize it as RBS or not.
It is easy to induce (any combination of high DA, high GW, high speed, high power, rapid change in attitude and/or turbulence).
It is also easy to recognize and recover from.